Magnetic-buoyancy-induced mixing in AGB stars: presolar SiC grains

D Vescovi, S Cristallo, M Busso… - The Astrophysical Journal …, 2020 - iopscience.iop.org
Isotope ratios can be measured in presolar SiC grains from ancient asymptotic giant branch
(AGB) stars at permil-level (0.1%) precision. Such precise grain data permit derivation of …

Presolar grain isotopic ratios as constraints to nuclear and stellar parameters of asymptotic giant branch star nucleosynthesis

S Palmerini, M Busso, D Vescovi, E Naselli… - The Astrophysical …, 2021 - iopscience.iop.org
Recent models for evolved low-mass stars (with M≲ 3 M⊙), undergoing the asymptotic giant
branch (AGB) phase assume that magnetic flux-tube buoyancy drives the formation of 13 C …

s-processing in AGB stars revisited. III. Neutron captures from MHD mixing at different metallicities and observational constraints

M Busso, D Vescovi, S Palmerini… - The Astrophysical …, 2021 - iopscience.iop.org
We present post-process neutron-capture computations for Asymptotic Giant Branch (AGB)
stars of 1.5–3 M⊙ and metallicities− 1.3≤[Fe/H]≤ 0.1. The reference stellar models are …

Re-evaluation of the Ne()Mg and Ne()Mg reaction rates

P Adsley, U Battino, A Best, A Caciolli… - arXiv preprint arXiv …, 2020 - arxiv.org
The competing $^{22} $ Ne ($\alpha,\gamma $) $^{26} $ Mg and $^{22} $ Ne ($\alpha, n $)
$^{25} $ Mg reactions control the production of neutrons for the weak $ s $-process in …

Magnetic-buoyancy-induced mixing in AGB stars: Fluorine nucleosynthesis at different metallicities

D Vescovi, S Cristallo, S Palmerini, C Abia… - Astronomy & …, 2021 - aanda.org
Asymptotic giant branch (AGB) stars are considered to be among the most significant
contributors to the fluorine budget in our Galaxy. While observations and theory agree at …

The importance of the 13C (α, n) 16O reaction in asymptotic giant branch stars

S Cristallo, M La Cognata, C Massimi… - The astrophysical …, 2018 - iopscience.iop.org
Low-mass asymptotic giant branch stars are among the most important polluters of the
interstellar medium. In their interiors, the main component (A≳ 90) of the slow neutron …

Trojan Horse investigation for AGB stellar nucleosynthesis

ML Sergi, G D'Agata, GL Guardo, GG Rapisarda… - Universe, 2022 - mdpi.com
Asymptotic Giant Branch (AGB) stars are among the most important astrophysical sites
influencing the nucleosynthesis and the chemical abundances in the Universe. From a pure …

Origin of large meteoritic SiC stardust grains in metal-rich AGB stars

M Lugaro, B Cseh, B Világos, AI Karakas… - The Astrophysical …, 2020 - iopscience.iop.org
Stardust grains that originated in ancient stars and supernovae are recovered from
meteorites and carry the detailed composition of their astronomical sites of origin. We …

New constraints on the major neutron source in low-mass AGB stars

N Liu, R Gallino, S Cristallo, S Bisterzo… - The astrophysical …, 2018 - iopscience.iop.org
We compare updated Torino postprocessing asymptotic giant branch (AGB) nucleosynthesis
model calculations with isotopic compositions of mainstream SiC dust grains from low-mass …

Additional fluorine abundance determinations in evolved stars

C Abia, S Cristallo, K Cunha, P De Laverny… - Astronomy & …, 2019 - aanda.org
We present new fluorine abundance measurements for a sample of carbon-rich asymptotic
giant branch (AGB) stars and two other metal-poor evolved stars of Ba/CH types. The …